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Holy Terror Assembly Sequence
Please see individual Version sections for specific instructions
0.
The first thing you must do is determine which version of the "Tiny
covers several versions so in order to get the optimum tone from your Upgraded amp, you'll need to
follow the correct instructions. Look for the main PCB's (printed circuit board) right hand corner for the
"ORO-PC211-X" (where "X" is a number from 1 to 4). Then, using the clues in the manual, determine
which version of "Tiny Terror"
1. Remove the amp's top and bottom covers. Remove the tube retainers and pull the tubes.
2. Discharge the caps! See appendix.
3. Disconnect clip leads from the main PCB for the OT (output transformer) and PT (power transformer).
4. Remove the output jack PCB by unscrewing the 3 output jack retaining nuts. Then desolder the three
transformer leads.
5. Pull the knobs and unscrew any retaining nuts for the Volume, Tone, Gain and Guitar Jack. The knobs
are pressure-fit, so use either a knob-puller, or a large screwdriver to carefully ply them off.
Note: Do not remove the lamp, but you'll need to unclip the yellow & black leads in order to get the
main PCB out of the chassis. Also remove any leads going to switches, chassis ground, etc., from
the PT.
6. Remove both transformers and save the bolts, you'll reuse them when mounting the Mercury
transformers.
7. On the chassis, mark off and drill the new holes (per the specifications of the manual's illustrated
diagrams) for the OT, and the optional Pentode/Triode Switch (PTS) if you are planning to install it (we
recommend that you do). For the OT only, swap the rubber grommets from the old holes to the new
holes. Do NOT bolt the PTS into the chassis, yet.
8. Mount the transformers in the locations and directions indicated in the illustrations noting which hole
each cluster of wires pass through. Use Loctite on the bolts.
9. Following the illustration, unsolder the components from the main PCB as indicated.
10. Following the illustrations, solder on all new components onto the main PCB. If you are installing the
optional PTS, tin and solder in the leads and extensions to R1 and R2, but do not connect them to
the actual switch, yet. We recommend building the "Voltage Divider" and the optional "RC Network"
separately to make installation easier.
At this point, triple check your work to make sure that nothing is missing or incorrectly modified. You are
about to reassemble the amp. If you later have to debug your work, it'll take considerable more time later.
11. Bolt back in the main PCB back into the chassis, using Loctite, but follow the hook-up sequence
indicated below.
a. Trim, tin and solder the OT's Blue/Red/Blue-White leads onto their indicated locations on the main
PCB. Note to cut the wires so that they can be tucked off the top edge of the board.
b. Trim, tin and solder the Blue/Red/Black leads to the output PCB, and re-attach it back into the
chassis. Note to tuck the wires towards the far wall of the chassis, away from the main PCB.
c. Complete the hookup of the PTS and bolt it into place. Depending upon your technique, you may
find it easier to bolt it into place first and complete the soldering from there. Do NOT over tighten the
PTS's retaining nut or you will strip the threads.
d. Reattach the chassis ground lead (Green-Yellow), trim and tin the PT's Green-Yellow lead – bolt
them both into the chassis in the original location.
6
This project and its documentation is the result of technical investigations made by the engineering staff of Mercury
you own.
Orange "Tiny
the furnishing of these documents does not constitute an expresed or implied license to use such materials.
Terror" you have. The manual
Terror" • Mercury "Holy Terror" Upgrade Kit
Magnetics. The disclosure of the information herein may pertain to proprietary rights and
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